Automatic firearm.



G. TOBORG.

AUTOMATIC PIBEARM.

APPLIoATIoN FILED .1111311.141124 Patented Dec. 17, 1912.

'Ilm

GEORGE TOBORG, 0F CHICAGO, ILLINOIS.

AUTOMATIC Specification of Letters Patent,

Application tiled July 11, 1912,

FIREARM.

Patented Dee. il, 1912.

seria; No. 798.5072

To whom. it 11mg/ r11/[fern:

Be it known that I, Gti-:onori ToBoRo. of Chicago, in the county of Cook und Stute of Illinois, have invented Certain new und useful Improvements in Automatic Firearms, of which the following iS a specification.

My invention relatesy to thaty Class of tiroarms in which n fart-ridge magazine i5 nrrnngetl in front of the breech and under the lmrrel and the chief .hjeet of my in'iproveniente; is the betterment of the construction Lshown in my United States Letters Patent. #1.008.498 issued Nov. 14, 1911.

(lther objet-ts will appear from the description ot' the ports and their Inode ot operation ns presently given.

lA attain the ohjerts host by the mechanism illustrated in tl l :xreonipnnying drawings in whichA Figure l is n longitudinal section through the elnunlmrell Morir-tranne und an url iuuent portion if thtl lz-nrrel und magazine. :intl ho\\.\ the r\- i} ro 'nting hreeeh-hloch :mtl rnrtritloe litter with other part in eleva-- tion :xe nrmnglwl in the ehnniher ot the stockn t'rnlne looking towurtl the left huntl esiti@ ot the gun: Fig'. u crow section taken :it the. line L) 2 ot" 'Fig'. l the view l.einf r enlarged; high?, nn enlarged la-tail showing the hreet'h hlmlt eletnt'lietl, :tml the. vien' heinl of the lett lmntl siate; ligf. l. :i sletul nhmvingr n lett hzllnl itle vir-w of the cartridge-lifter .leturhr-rl: :unl Fig'. ."3, :1. iltztziil L-ho\\ing r. top rie/w oli' the enrtritlge-litter.

Similar numerals roter to throughout the vseveral viens.

ie the hnrrei; T. the cartridge magazine; H, the Chuniheretl etooloframe; 1), the recipromitin;d breech-Mark; and lO, the Cartridge lifter. i

The hreetlrhloeli in Cross eettion has the shape of an inverted L the top part ot' which fills the width of the chamber 8 :it the roof and sliderv thereuguinst, being stopped against the ends ol the chamber. The vertical part ot the inverted L depends in the chamber at the eide andlides on or against. the adjacent side ot' the cartridge-lifter, resting on a. ledge 8b of the Chamber wall. Un the right hund side and near the end of the hreech-l lock pointing toward the guns muz zle, is mounted the usual spring-presed gliell extractor tl (Fig. 3) and on the 0ppo- :ite: side of said hreechhloek. at the same level with the extractor, is a groove 9* similar Hertel tlirrffughout its,` length. On the top of Suhl liloet und at the front encl foi-ined t btout nrrn or etension il which worlt, in n channel or slot 8 formed in the root' of ehan'iher S, said extension meeting the end of will uhunnel simultaneously with the Quid hlocks striking the rear wall or end of chamber 83.

The under side of the breech-block is prt vitletl with, a groeve in which is mounted a tiring pin E?" which has u portion 5)" that project;l out through Huid groove zinrl ear riee :i tapered front end. A pin or lug 8d (shown hy dotted linea Fig. l) works; in the ,Q1-ome 9*' to lrnork the. Shell out of the ext: .ftor. in a `groove on the opposite riale et the hreerli-hloek is a spring arm 9S the tip eml of which 9 is a pin wt in n hole in that per! :intl ynfisieeting; ont of the. LY'HIfe hut ifi t nofl to he tloprer-(l in said hole t the h ot' the nrtziee of the hlm-lt.

litter in length tj-ori'rfwotnlw e anni ir. pivmttl therein nih the elmnr nl the i i tot' with. f in thielou. und t'urtl'ler on 1 will it l5 mit t" ji\ Html than halt' l. tizio near the pl und Whew at :':gznn tsuitiztily filley the width miller That itle lil of t? lifter Y W Vtroni the thirltenetl enti.

end; 10d tra-e to ri e :intl full within the linnn of the ehnniher mtl has a r11 Ceptiiele UF having in open mit heilig' :nu discharge end 1" otY` the eartritlgfe uwer/,ine so that when relelzsl-wl the udjfue. enrLitlLje will pms troni tlv:A nl mine into did reeept; ele, the reni* enel or ,fini of the e; rtritlge, striking a stop ll proja-wting up from the loor of the chamber 6a after the point of the bullet has pushed behind the rear end or vertical line of the gun barrel. The Side 10C of the lifter at l()g in provided with an inclined surface for a short distance, which serves to raise, the pin 9h into the wav lo" at' the pivotal end of the lifter as .said pin passes said inclined surface. The topof tte of it there is" lain;

lifter, just behind the cartridge receptacle is provided with an inclined groove 10h which is traversed by the tapered front end of the portion 9c of the firing pin in order to raise the rear end or rim of the cartridge to the level of the barrel bore just previous to the points entering the bore. l.The breech-block is under the constant pressure of a sprin 12 held in a bore of the stock-frame over t e chamber 8 and communicating therewith through the slot 8c which allows the arm 9 to reciprocate in said slot. The hammer 13 is mounted within the chamber 8EL so as to be turned back and set by the recoil of the breech-block. 14 is the main spring, and 15 the trigger. The opening 16 where the spent shell is thrown out is completely covered by the breeeh block as it slides against the chamber wall.

In operation the recoil of the firing throws the breech-block back against the rear wall of the chamber S8L and the spring 12 bearing upon the arm 9c ret-urns it. In the backward movement the pin 9 will strike the ineline 108 and be thereby deflected so as to fall into engagement with the way 10d at the rear end on the rearward Inovement. From this pointsaid way is inclined downward for a portion of the way so that the return will cause the lifting of the free end of the lifter. Then follows a level portion of said Way and then an upgrade ada ptcd to produce the desired depression of the lifter during;the remainder of the return or the required portion of it. .lhe stop ll is arranged on the floor of the frame chamber and stav ds high enough and broad enough to closey the lifter re(,;eptaclc at the rear so as to preclude the possibility of the cartridge .ever passing back too far. The distance of this from the rear end of the barrel bore is preferably the same as the lengt-h of the car ridge.

1`le artridge can be made so as to lie loosely/iin the lifter receptacle when just put in, and, through the instrumentality of the tap ring portici of the firing pin traversing he inclined` 'oove 10n of the lifter recepta le, can be beveled with the gu'n bore anjd held in positive apposition therewith when being entered and pushed in.

The fiin 9, carried by the breech-block, travels back and forth lengthwise of the frame halnber in straight line, and the loam Waly 10h on th pivoted lifter imparts ,transverse movements to the lifter. The lfirst pai't of the return movement produces an upward movtlment of the free cud of the clifter and the retnainder of tlle return movc- :ment roduces a downwad movement of the li ter, which is thereb brought befoi'e the o en magazine to re .ive the charge, and t 'e pin 9*' is passed ut of connection with said cam wayi the ecoil irnwement passing said pinover the `am surface 10g,

effecting the-connection of said pin with the way 10d at the opposite end of said Way.

What I claim is 1. In an automatic firearm, a barrel, magazine, and chambered frame, in combination with a reciprocating breech-block rovided with a spring arm, a pivoted cartrldge lifter provided with a way having parts oppositely inclined toward the ends and a level part at about its mid-length, said way being arranged in the path of the spring arm, and means for causing the spring arm to engage with said way at its rear end and to disengage therefrom at its front end.

2. In an automatic firearm, the barrel, magazine and chambered frame, in combination with a reciprocating breech-block provided with a slot for the firing pin and a downward extension from the firing pin having a tapering point, a pivoted cartridge lifter with a cartridge receptacle having an inclined groove 10 adapted to be traversed by said tapering point at each return of the breech-block for leveling the cartridge with the barrel bore.

3. In an automatic firearm, a barrel, mag azine, and ehambered frame, in combination with a reciprocating breech-block and pivoted cartridge lifter provided with a cartridge receptacle with its opening facing toward the magazine and a cam way l0'1 on the lifter having reverse inclincs, a spring arm mounted on the breech-block, and adapted to traverse the cam way through both inclines during the return movement of the breech-block, means for shunting the spring arm into engagement with the rear end of the way and a stop means for checking the movement of the cartridge in the receptacle. 7

t. In an automatic firearm, a barrel, magazine and chambered frame,` in combination with a reciprocating breech-block and a. pivoted cartridge lifter, the latter being provided with a vertically curved cam way 10" having reverse inclines toward its ends, a laterally extended cam 10ig on the lifter, andv a spring arm mounted on the brecclrblock and adapted to traverse the cam way on the return movement of the breech-block.

ln an automatic fire-arm,a barrel, magazine and cbambered frame, in combination with a reciprocating breech-block and a pivoted cartridge lifter, a spring pin mounted on the breech-block and variously inclined cam surfaces formed on the lifter andadaptcd to produce connection of the spring pin with the lit'ter at the connuencenient of the return movement of the breech block and disconnection during the backward movement of the breech-block.

6. In an automatic firearm, the combination with a longitudinally reciprocating breech-block of a pivoled cartridge lift-er, a. spring pin mounted on the breech-block, a 

